Econ. Environ. Geol. 2014; 47(1): 29-38

Published online February 28, 2014

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

Reactivated Timings of Some Major Faults in the Chugaryeong Fault Zone since the Cretaceous Period

Donghoon Chung1, Yungoo Song1*, Changyun Park1, Il-Mo Kang2, Sung-Ja Choi2 and Chuluunbaatar Khulganakhuu1

1Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
2Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

Correspondence to : yungoo@yonsei.ac.kr

Received: February 10, 2014; Revised: February 24, 2014; Accepted: February 25, 2014

Abstract

  Recently developed illite-age-analysis (IAA) approach has been applied to determine the multiple events for the Singal and Wangsukcheon faults in the Chugaryeong fault belt, Korea. Fault reactivated events during Late Cretaceous to Paleogene events(69.2±0.3 Ma and 27.2±0.5 Ma) for the Singal fault and of 75.4±0.8 Ma for the Wangsukcheon fault were determined by combined approach of the optimized illite-polytype quantification and the K-Ar age-dating of clay fractions separated from the fault clays. These absolute geochronological determinations of the multiple tectonic events recorded in the Chugaryeong fault belt are crucial to establish the tectonic evolution of the Korean Peninsula since Late Cretaceous.

Keywords Chugaryeong fault, K-Ar age-dating, fault clay, illite-age-analysis(IAA), illite polytype

Article

Econ. Environ. Geol. 2014; 47(1): 29-38

Published online February 28, 2014

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

Reactivated Timings of Some Major Faults in the Chugaryeong Fault Zone since the Cretaceous Period

Donghoon Chung1, Yungoo Song1*, Changyun Park1, Il-Mo Kang2, Sung-Ja Choi2 and Chuluunbaatar Khulganakhuu1

1Department of Earth System Sciences, Yonsei University, Seoul 120-749, Korea
2Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea

Correspondence to:yungoo@yonsei.ac.kr

Received: February 10, 2014; Revised: February 24, 2014; Accepted: February 25, 2014

Abstract

  Recently developed illite-age-analysis (IAA) approach has been applied to determine the multiple events for the Singal and Wangsukcheon faults in the Chugaryeong fault belt, Korea. Fault reactivated events during Late Cretaceous to Paleogene events(69.2±0.3 Ma and 27.2±0.5 Ma) for the Singal fault and of 75.4±0.8 Ma for the Wangsukcheon fault were determined by combined approach of the optimized illite-polytype quantification and the K-Ar age-dating of clay fractions separated from the fault clays. These absolute geochronological determinations of the multiple tectonic events recorded in the Chugaryeong fault belt are crucial to establish the tectonic evolution of the Korean Peninsula since Late Cretaceous.

Keywords Chugaryeong fault, K-Ar age-dating, fault clay, illite-age-analysis(IAA), illite polytype

    KSEEG
    Jun 30, 2024 Vol.57 No.3, pp. 281~352

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